Drive devices and household appliances

Abstract

This disclosure provides a drive device and a household appliance. The drive device includes: a rotating shaft; a rotor disposed on the rotating shaft and rotating with the rotating shaft; and a stator adapted to the rotor. The rotating shaft includes a first shaft and a second shaft coaxially arranged, with the first shaft slidably connected to the second shaft along the axial direction of the rotating shaft. The drive device further includes an adjustment mechanism, which, along with the rotor, is disposed on the first shaft. The adjustment mechanism is configured to adjust the axial displacement of the first shaft relative to the second shaft along the rotating shaft based on the rotational speed of the first shaft. This solution can improve the speed regulation effect and efficiency of the drive device.

Description

Technical Field

[0001] This utility model relates to the field of drive device technology, and in particular to a drive device and a household appliance. Background Technology

[0002] Household appliances such as washing machines, dryers, and shoe washers are typically equipped with drive units to operate them. Permanent magnet synchronous motors (PMSMs), as a type of drive unit, are increasingly widely used in household appliances due to their high power density and efficiency. When operating at high speeds, PMSMs usually require field weakening control to increase motor speed by reducing the magnetic field energy. For example, this can be achieved by increasing the field weakening current.

[0003] However, increasing the motor speed by reducing the magnetic field energy through increasing the weakening current has problems such as difficulty in weakening the magnetic field at high speeds and the risk of demagnetization when the weakening current is too large. These problems will cause the motor speed to fall short of the expected speed and increase the power consumption, which will lead to unsatisfactory motor speed regulation and low motor efficiency. Summary of the Invention

[0004] The technical problem solved by this utility model is that the drive device has difficulties in weakening the magnet during high-speed operation and risks of demagnetization when the weakening current is too large, which leads to unsatisfactory speed regulation effect and low efficiency.

[0005] To solve the above-mentioned technical problems, this utility model provides a driving device, including: a rotating shaft; a rotor disposed on the rotating shaft and rotating with the rotating shaft; a stator adapted to the rotor; the rotating shaft includes a first shaft and a second shaft coaxially arranged, the first shaft being slidably connected to the second shaft along the axial direction of the rotating shaft; the driving device further includes an adjustment mechanism, the adjustment mechanism and the rotor being disposed on the first shaft, the adjustment mechanism being configured to adjust the axial displacement of the first shaft relative to the second shaft along the rotating shaft based on the rotational speed of the first shaft.

[0006] Compared with the prior art, the technical solution of this utility model embodiment has the following beneficial effects: In this embodiment of the invention, the drive device employs a first shaft and a second shaft coaxially arranged, with the first shaft slidably connected to the second shaft along the axial direction of the shaft. During operation, the first and second shafts cooperate to allow the adjustment mechanism on the first shaft to adjust the axial displacement of the first shaft relative to the second shaft based on the rotational speed of the first shaft, thereby dynamically adjusting the relative positions of the rotor and stator. Because the relative positions of the rotor and stator differ, the air gap magnetic field strength between them also differs. Thus, without adjusting the weakening magnetic current, the air gap magnetic field strength between the rotor and stator can be adjusted by dynamically adjusting their relative positions. Specifically, when the centers of the rotor and stator are aligned, the air gap magnetic field is strongest, and the torque output by the drive device is maximized. By adjusting the relative positions of the rotor and stator, the rotor is extracted from the stator. As the rotor is extracted, the air gap magnetic field strength gradually decreases. By reducing the air gap magnetic field strength, the magnetic field energy is reduced, achieving weakening magnetic control of the drive device and increasing its rotational speed. This allows for the reduction of magnetic field energy and the increase of drive unit speed without relying on increasing the weakening current. Therefore, it effectively avoids the difficulties in weakening the magnetic field and the risk of demagnetization caused by excessive weakening current, which are associated with increasing magnetic field energy and thus increasing drive unit speed. This helps the drive unit achieve the expected speed and control power consumption, improving the speed regulation effect and efficiency of the drive unit.

[0007] Optionally, the adjusting mechanism includes: a disc body connected to the first shaft, the disc body having multiple sliding grooves arranged radially along the radial direction of the disc body, each sliding groove having a first end and a second end, the first end being near the central region of the disc body and the second end being near the edge of the disc body; an elastic element located within the sliding groove and near the second end; and a movable ball located within the sliding groove, the position of the movable ball within the sliding groove being adjusted based on the rotational speed of the first shaft. When the first shaft rotates with the rotor, the movable ball is subjected to centrifugal force. As the rotational speed of the first shaft increases, when the centrifugal force on the movable ball exceeds the elastic force of the elastic element, the elastic element is compressed and stores energy. Under the action of centrifugal force, the movable ball abuts against the second end of the sliding groove via the elastic element. Under the action of centrifugal force, the disc body drives the first shaft to move relative to the second shaft along the axial direction of the rotating shaft, so that the rotor is pulled away from the stator. For example, the disc body drives the first shaft to move along the axial direction of the rotating shaft towards or away from the second shaft. When the rotor speed decreases, the speed of the first shaft also decreases accordingly. At this time, the centrifugal force on the moving ball decreases. Since the centrifugal force on the moving ball is less than the elastic force of the elastic element, under the action of the elastic force generated by the stored energy in the elastic element, the moving ball will move along the slide groove from the second end towards the first end. Simultaneously, the disc body drives the first shaft to move relative to the second shaft along the axial direction of the rotating shaft, so that the centers of the rotor and stator tend to align. For example, the disc body will drive the first shaft to move along the axial direction of the rotating shaft in a direction away from or towards the second shaft. In this way, the position of the moving ball within the slide groove can be adjusted based on the speed of the first shaft, thereby achieving dynamic adjustment of the relative position of the stator and rotor.

[0008] Optionally, the adjustment mechanism further includes an elastic support portion disposed between the first shaft and the second shaft. The elastic support portion is configured to be compressed and store energy when the first shaft moves toward the second shaft along the axial direction of the rotating shaft, and to push the first shaft away from the second shaft along the axial direction of the rotating shaft through the stored energy. Alternatively, the elastic support portion is configured to be stretched and store energy when the first shaft moves away from the second shaft along the axial direction of the rotating shaft, and to pull the first shaft toward the second shaft along the axial direction of the rotating shaft through the stretched energy. By moving the first shaft toward or away from the second shaft along the axial direction of the rotating shaft, the rotor is extracted from the stator portion, reducing the air gap magnetic field strength and thus reducing the magnetic field energy, achieving weak magnetic control of the drive device to increase the rotational speed of the drive device. After the rotor is extracted from the stator portion, as the rotor speed decreases, the compressed or stretched energy stored by the elastic support portion can help drive the rotor to move in a direction aligned with the center of the stator, thereby increasing the air gap magnetic field strength, reducing the rotational speed of the drive device, and increasing the torque of the drive device.

[0009] Optionally, a connecting shaft is provided at one end of the first shaft facing the second shaft, and the second shaft is provided with a groove; or, a groove is provided at one end of the first shaft facing the second shaft, and the second shaft is provided with a connecting shaft, wherein the groove is adapted to the connecting shaft and limits the maximum distance of movement of the first shaft relative to the second shaft in the axial direction of the rotating shaft, and the elastic support is sleeved on the connecting shaft.

[0010] Optionally, a stop wall is provided on the end face of the second shaft near the first shaft, the stop wall being used to restrict the position of the elastic support portion.

[0011] Optionally, the disc body has a slope, the slope being configured such that the thickness of the disc body gradually decreases from the center region of the disc body to the edge, wherein a plurality of grooves are provided on the slope.

[0012] Optionally, the drive device includes any of the following types of motors: radial inner rotor motor, radial outer rotor motor, and axial flux motor.

[0013] Optionally, when the type of the drive device is the radial inner rotor motor, the drive device further includes: a first bearing sleeved on the first shaft; a second bearing sleeved on the second shaft; an end cover connected to the first bearing and the second bearing, the end cover having a cavity for accommodating the rotor, the adjusting mechanism and a portion of the rotating shaft; wherein the stator is connected to the end cover.

[0014] Optionally, the end cap includes: a first end cap, which is sleeved on the first shaft via the first bearing; and a second end cap, which is sleeved on the second shaft via the second bearing and connected to the first end cap.

[0015] This utility model embodiment also provides a household appliance, including any of the above-mentioned driving devices. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a driving device according to an embodiment of the present utility model; Figure 2 yes Figure 1 A partial structural diagram; Figure 3 This is a partial structural schematic diagram of another driving device in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of another driving device in an embodiment of this utility model; Figure 5 This is a schematic diagram of another driving device in an embodiment of the present utility model.

[0017] Explanation of reference numerals in the attached figures: 100-Drive device; 1-Rotating shaft; 11-First shaft; 111-Connecting shaft; 12-Second shaft; 121-Groove; 122-Stop wall; 2-Rotor; 3-Stator; 4-Adjusting mechanism; 41-Disc body; 411-Inclined surface; 412-Slide groove; 42-Elastic element; 43-Moving ball; 44-Elastic support part; 5-First bearing; 6-Second bearing; 7-End cover; 71-First end cover; 72-Second end cover; 73-Cavity. Detailed Implementation

[0018] To make the above-mentioned objectives, features and beneficial effects of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] This utility model provides a driving device, which is described below with reference to... Figures 1 to 5 The specific structure of the drive device will be described.

[0020] In a specific implementation, the drive device 100 may include: a rotating shaft 1, a rotor 2, a stator 3, and an adjustment mechanism 4. The rotor 2 is disposed on the rotating shaft 1 and rotates with the rotating shaft 1. The stator 3 is adapted to the rotor 2. The rotating shaft 1 includes a first shaft 11 and a second shaft 12 coaxially arranged, and the first shaft 11 is slidably connected to the second shaft 12 along the axial direction of the rotating shaft 1. The adjustment mechanism 4 and the rotor 2 are both disposed on the first shaft 11, and the adjustment mechanism 4 is configured to adjust the axial displacement of the first shaft 11 relative to the second shaft 12 along the rotating shaft 1 based on the rotational speed of the first shaft 11.

[0021] As can be seen from the above, the drive device 100's rotating shaft 1 adopts a first shaft 11 and a second shaft 12 coaxially arranged, and the first shaft 11 is slidably connected to the second shaft 12 along the axial direction of the rotating shaft 1. During the operation of the drive device 100, through the mutual cooperation of the first shaft 11 and the second shaft 12, the adjustment mechanism 4 provided on the first shaft 11 can adjust the axial displacement of the first shaft 11 relative to the second shaft 12 based on the rotational speed of the first shaft 11, thereby dynamically adjusting the relative position of the rotor 2 and the stator 3. Since the relative positions of the rotor 2 and the stator 3 are different, the air gap magnetic field strength between the rotor 2 and the stator 3 is different. Thus, without adjusting the weak magnetic current, the air gap magnetic field strength between the rotor 2 and the stator 3 can be dynamically adjusted by dynamically adjusting the relative position of the rotor 2 and the stator 3. Specifically, when the centers of the rotor 2 and the stator 3 are aligned, the air gap magnetic field between the rotor 2 and the stator 3 is the strongest, and the torque output by the drive device 100 is the greatest. By adjusting the relative position of rotor 2 and stator 3, rotor 2 is extracted from stator 3. As rotor 2 is extracted, the air gap magnetic field strength gradually decreases, and the magnetic field energy diminishes. By reducing the air gap magnetic field, field weakening control of the drive device 100 can be achieved, thereby increasing the speed of the drive device 100. This eliminates the need to increase the field weakening current to reduce magnetic field energy and increase the speed of the drive device 100. Therefore, it effectively avoids the difficulties in field weakening and the risk of demagnetization caused by excessive field weakening current, which are associated with increasing the field weakening current to reduce magnetic field energy and thus increase the speed of the drive device. This helps the drive device achieve the expected speed and control power consumption, improving the speed regulation effect and efficiency of the drive device.

[0022] In some embodiments, the second axis 12 can serve as an output axis.

[0023] In a specific implementation, a connecting shaft 111 is provided at one end of the first shaft 11 facing the second shaft 12, and a groove 121 is provided on the second shaft 12. Alternatively, a groove 121 is provided at one end of the first shaft 11 facing the second shaft 12, and a connecting shaft 111 is provided on the second shaft 12. The groove 121 is adapted to the connecting shaft 111 and limits the maximum distance of movement of the first shaft 11 relative to the second shaft 12 in the axial direction of the rotating shaft 1. The accompanying drawings illustrate an example where the first shaft 11 is provided with a connecting shaft 111 and the second shaft 12 is provided with a groove 121. When the first shaft 11 is provided with a groove 121 and the second shaft 12 is provided with a connecting shaft 111, adaptive adjustments can be made based on the drawings provided in this embodiment of the invention, which will not be illustrated here.

[0024] In some embodiments, the connecting shaft 111 is coaxial with the first shaft 11. A groove 121 is provided on the end face of the second shaft 12 facing the first shaft 11, and the depth direction of the groove 121 is parallel to the axial direction of the rotating shaft 1.

[0025] In other embodiments, the connecting shaft 111 is coaxial with the second shaft 12. A groove 121 is provided on the end face of the first shaft 11 facing the second shaft 12, and the depth direction of the groove 121 is parallel to the axial direction of the rotating shaft 1.

[0026] The outer surface shape of the connecting shaft 111 is adapted to the inner surface shape of the groove 121. For example, the cross-section of the outer surface of the connecting shaft 111 along the radial direction of the connecting shaft 111 is a polygon such as a triangle, quadrilateral, or pentagon, where the polygon can be a regular polygon or a non-regular polygon. By matching the shapes of the connecting shaft 111 and the groove 121, the first shaft 11 can drive the second shaft 12 to rotate.

[0027] The length of the connecting shaft 111 is related to the maximum displacement of the relative movement of the first shaft 11 and the second shaft 12, and the length of the connecting shaft 111 is not less than the maximum displacement.

[0028] In a specific implementation, the adjusting mechanism 4 may include: a disc body 41, an elastic element 42, and a movable bead 43. The disc body 41 is connected to the first shaft 11. The disc body 41 is provided with a plurality of sliding grooves 412, which are arranged radially along the radial direction of the disc body 41. Each sliding groove 412 includes a first end and a second end, with the first end near the central region of the disc body 41 and the second end near the edge of the disc body 41. The elastic element 42 is located within the sliding groove 412 and is located near the second end. The movable bead 43 is located within the sliding groove 412, and its position within the sliding groove 412 is adjusted based on the rotational speed of the first shaft 11.

[0029] The disc body 41 has an inclined surface 411, which is configured such that the thickness of the disc body 41 gradually decreases from the center region to the edge. A plurality of grooves 412 are provided on the inclined surface 411.

[0030] In some embodiments, refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 The inclined surface 411 faces the rotor 2 and is inclined away from the rotor 2. That is, the inclined surface 411 faces the rotor 2 and is away from the second shaft 12.

[0031] In other embodiments, see Figure 3 The inclined surface 411 faces away from the rotor 2 and is inclined in a direction close to the rotor 2. That is, the inclined surface 411 faces away from the rotor 2 and towards the second shaft 12.

[0032] When the first shaft 11 rotates with the rotor 2, the moving bead 43 is subjected to centrifugal force, which causes the moving bead 43 to tend to move along the first end and toward the second end. The magnitude of the centrifugal force on the moving bead 43 varies depending on the rotational speed of the first shaft 11, and the rotational speed of the first shaft 11 is positively correlated with the magnitude of the centrifugal force on the moving bead 43. When the rotational speed of the first shaft 11 reaches a first set speed threshold, the centrifugal force on the moving bead 43 is greater than the elastic force of the elastic element 42. Under the action of centrifugal force, the moving bead 43 overcomes the elastic force of the elastic element 42 and moves from the first end toward the second end, while the elastic element 42 is compressed and stores energy. During this process, under the action of centrifugal force, the moving bead 43 abuts against the second end of the slide groove 412 via the elastic element 42, and under the action of centrifugal force, it drives the first shaft 11 to move relative to the second shaft 12 along the axial direction of the rotating shaft 1 via the disc body 41. The direction of movement of the first shaft 11 relative to the second shaft 12 along the axial direction of the rotating shaft 1 is related to the setting direction of the inclined surface 411, which will be explained below.

[0033] Combination Figure 1 , Figure 2 , Figure 4 and Figure 5 If the inclined surface 411 faces the rotor 2 and is tilted away from the rotor 2, then the first shaft 11 moves along the axial direction of the rotating shaft 1 towards the second shaft 12, causing the rotor 2 to be partially removed from the stator 3. This reduces the air gap magnetic field strength between the rotor 2 and the stator 3, weakening the magnetic field energy and helping to increase the rotational speed of the drive device 100. Thus, when the drive device 100 operates at high speed, the high-speed range of the drive device 100 can be increased without adding an additional demagnetizing current, widening the operating range of the drive device 100. Simultaneously, the demagnetizing current of the drive device is reduced, effectively avoiding demagnetization problems caused by excessive demagnetizing current.

[0034] When the rotational speed of rotor 2 decreases, the rotational speed of the first shaft 11 also decreases accordingly. At this time, the centrifugal force on the moving ball 43 decreases. When the rotational speed of the first shaft 11 is less than the second set speed threshold, the centrifugal force on the moving ball 43 is less than the elastic force of the elastic element 42. Under the action of the elastic force generated by the energy stored in the elastic element 42, the moving ball 43 will move along the slide groove 412 from the second end to the first end. At this time, the disk body 41 will drive the first shaft 11 to move along the axial direction of the rotating shaft 1 in a direction away from the second shaft 12, so that the centers of rotor 2 and stator 3 tend to align, and the air gap and air gap magnetic field between rotor 2 and stator 3 gradually increase. When the centers of rotor 2 and stator 3 are aligned, the air gap magnetic field strength is the maximum, and a larger torque can be output at this time. This enables the drive device 100 to output a higher torque when running at low speed.

[0035] Combination Figure 3The inclined plane 411 faces away from the rotor 2 and is tilted towards the direction closer to the rotor 2. At this time, the first shaft 11 moves away from the direction closer to the second shaft 12 along the axial direction of the rotating shaft 1, causing the rotor 2 to be partially removed from the stator 3. The air gap magnetic field between the rotor 2 and the stator 3 is reduced, thus weakening the magnetic field energy and helping to increase the rotational speed of the drive device 100. In this way, when the drive device 100 is moving at high speed, the high-speed range of the drive device 100 can be increased without adding an additional demagnetizing current, widening the operating range of the drive device 100. At the same time, the demagnetizing current of the drive device is reduced, effectively avoiding the demagnetization problem caused by excessive demagnetizing current of the drive device 100.

[0036] When the rotational speed of rotor 2 decreases, the rotational speed of the first shaft 11 also decreases accordingly. At this time, the centrifugal force on the moving ball 43 decreases. When the rotational speed of the first shaft 11 is less than the second set speed threshold, the centrifugal force on the moving ball 43 is less than the elastic force of the elastic element 42. Under the action of the elastic force generated by the energy stored in the elastic element 42, the moving ball 43 will move along the slide groove 412 from the second end toward the first end. At this time, the disk body 41 will drive the first shaft 11 to move along the axial direction of the rotating shaft 1 toward the direction closer to the second shaft 12, so that the centers of rotor 2 and stator 3 tend to align, and the air gap and air gap magnetic field between rotor 2 and stator 3 gradually increase. When the centers of rotor 2 and stator 3 are aligned, the air gap magnetic field strength is the maximum, and a larger motor torque can be output at this time. This enables the drive device 100 to output a higher torque when running at low speed.

[0037] Furthermore, when the drive unit 100 is running at extremely high speed, the adjustment mechanism 4 reaches its maximum adjustment capacity. At this time, the speed range of the drive unit 100 can be further increased by adjusting the demagnetizing current (e.g., increasing the demagnetizing current). Using a mechanical structure involving the first shaft 11 and the second shaft 12 to weaken the magnetism can effectively reduce the demagnetizing current. Compared to relying solely on the demagnetizing current, this significantly reduces the risk of demagnetization in the drive unit 100, improves speed regulation, and enhances the efficiency of the drive unit.

[0038] It should be noted that the terms "low speed" in low-speed operation, "high speed" in high-speed operation, and "extremely high speed" in extremely high-speed operation of the drive device 100 are relative. The rotational speed of the drive device 100 during low-speed operation, high-speed operation, and extremely high-speed operation increases sequentially.

[0039] In a specific implementation, the adjustment mechanism 4 further includes an elastic support portion 44. The elastic support portion 44 is disposed between the first shaft 11 and the second shaft 12. The elastic support portion 44 can be configured to be compressed and store energy when the first shaft 11 moves towards the second shaft 12 along the axial direction of the rotating shaft 1, and to push the first shaft 11 away from the second shaft 12 along the axial direction of the rotating shaft 1 through the compressed and stored energy. After the rotor 2 is partially removed from the stator 3, as the rotational speed of the rotor 2 decreases, the elastic support portion 44 helps to drive the rotor 2 to move in a direction aligned with the center of the stator 3.

[0040] The elastic support 44 can also be configured to be stretched and store energy when the first shaft 11 moves away from the second shaft 12 along the axial direction of the rotating shaft 1, and to pull the first shaft 11 toward the second shaft 12 along the axial direction of the rotating shaft 1 by the stretched and stored energy.

[0041] The working state (compressed or stretched) of the elastic support 44 is related to the orientation of the inclined surface 411 of the disc 41. If the inclined surface 411 faces the rotor 2 and is inclined away from the rotor 2, the elastic support 44 is configured to be compressed and store energy when the first shaft 11 moves toward the second shaft 12 along the axial direction of the rotating shaft 1. If the inclined surface 411 faces away from the rotor 2 and is inclined toward the rotor 2, the elastic support 44 is configured to be stretched and store energy when the first shaft 11 moves away from the second shaft 12 along the axial direction of the rotating shaft 1. In some embodiments, the elastic support 44 can be a spring or an elastic component such as elastic rubber.

[0042] In some non-limiting embodiments, the elastic support 44 is sleeved on the connecting shaft 111.

[0043] In a specific implementation, a stop wall 122 is provided on the end face of the second shaft 12 near the first shaft 11. The stop wall 122 is used to limit the position of the elastic support portion 44. The stop wall 122 protrudes from the outer surface of the second shaft 12.

[0044] In some non-limiting embodiments, the diameter of the connecting shaft 111 is smaller than the diameter of other parts of the first shaft 11, thus creating a cross-section at the junction of the connecting shaft 111 and other areas of the first shaft 11. A disc body 41 is disposed near the connecting shaft 111, and the side of the disc body 41 facing the second shaft 12 is flush with the cross-section. An elastic support portion 44 may be located between the cross-section and the stop wall 122, or it may be disposed between the disc body 41 and the stop wall 122.

[0045] In specific implementations, the drive device includes any one of the following types of motors: radial inner rotor motor, radial outer rotor motor, and axial flux motor. Among them, Figures 1 to 3 The illustrated motor type is a radial internal rotor motor. Figure 4 The illustrated motor type is an axial flux motor. Figure 5 The illustrated motor type is a radial external rotor motor.

[0046] Reference Figures 1 to 3 When the type of the drive device is the radial inner rotor motor, the drive device 100 further includes: a first bearing 5, a second bearing 6, and an end cover 7. The first bearing 5 is sleeved on the first shaft 11; the second bearing 6 is sleeved on the second shaft 12; the end cover 7 is connected to the first bearing 5 and the second bearing 6, and the end cover 7 has a cavity 73, which is used to accommodate the rotor 2, the adjusting mechanism 4, and a portion of the rotating shaft 1; wherein, the stator 3 is connected to the end cover 7.

[0047] In some embodiments, the end cap 7 includes a first end cap 71 and a second end cap 72. The first end cap 71 is sleeved on the first shaft 11 via the first bearing 5; the second end cap 72 is sleeved on the second shaft 12 via the second bearing 6 and is connected to the first end cap 71.

[0048] This utility model embodiment also provides a household appliance, which includes any of the above-described driving devices. For the specific structure of the driving device, please refer to the description in the above embodiments, which will not be repeated here.

[0049] Household appliances include washing machines, dryers, washer-dryer combos, shoe washers, fans, and range hoods.

[0050] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this utility model disclosure, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this utility model disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with the technical features of the independent claims as needed and where technically feasible, and the technical features from the respective independent claims may be combined in any suitable manner rather than solely by the specific combinations listed in the claims.

[0051] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A driving device, comprising: Rotating shaft (1); The rotor (2) is located on the rotating shaft (1) and rotates with the rotating shaft (1); The stator (3) is adapted to the rotor (2); The rotating shaft (1) is characterized in that it includes a first shaft (11) and a second shaft (12) coaxially arranged, and the first shaft (11) is slidably connected to the second shaft (12) along the axial direction of the rotating shaft (1). The drive device (100) further includes an adjustment mechanism (4), which and the rotor (2) are both disposed on the first shaft (11). The adjustment mechanism (4) is configured to adjust the axial displacement of the first shaft (11) relative to the second shaft (12) along the rotating shaft (1) based on the rotational speed of the first shaft (11).

2. The driving device as described in claim 1, characterized in that, The adjustment mechanism (4) includes: The disc body (41) is connected to the first shaft (11). The disc body (41) is provided with a plurality of sliding grooves (412). The plurality of sliding grooves (412) are arranged radially along the radial direction of the disc body (41). The sliding groove (412) includes a first end and a second end. The first end is close to the central region of the disc body (41), and the second end is close to the edge of the disc body (41). The elastic element (42) is located within the groove (412) and near the second end; The movable bead (43) is located in the groove (412), and the position of the movable bead (43) in the groove (412) is adjusted based on the rotational speed of the first shaft (11).

3. The driving device as described in claim 2, characterized in that, The adjustment mechanism (4) further includes: an elastic support (44) disposed between the first shaft (11) and the second shaft (12). The elastic support (44) is configured to be compressed and store energy when the first shaft (11) moves toward the second shaft (12) in the axial direction of the rotating shaft (1), and to push the first shaft (11) to move away from the second shaft (12) in the axial direction of the rotating shaft (1) by the compressed and stored energy. Alternatively, the elastic support (44) is configured to be stretched and store energy when the first shaft (11) moves away from the second shaft (12) in the axial direction of the rotating shaft (1), and to pull the first shaft (11) to move toward the second shaft (12) in the axial direction of the rotating shaft (1) by the stretched and stored energy.

4. The driving device as described in claim 3, characterized in that, The first shaft (11) is provided with a connecting shaft (111) at one end facing the second shaft (12), and the second shaft (12) is provided with a groove (121). Alternatively, the first shaft (11) is provided with a groove (121) at one end facing the second shaft (12), and the second shaft (12) is provided with a connecting shaft (111). The groove (121) is adapted to the connecting shaft (111) and limits the maximum distance of movement of the first shaft (11) relative to the second shaft (12) in the axial direction of the rotating shaft (1). The elastic support (44) is sleeved on the connecting shaft (111).

5. The driving device as described in claim 3 or 4, characterized in that, The second shaft (12) has a stop wall (122) on its end face near the first shaft (11), and the stop wall (122) is used to limit the position of the elastic support (44).

6. The driving device as described in claim 2, characterized in that, The disc body (41) has a slope (411) configured such that the thickness of the disc body (41) gradually decreases from the center region of the disc body (41) to the edge, wherein a plurality of grooves (412) are provided on the slope (411).

7. The driving device as described in claim 2, characterized in that, The drive device includes any of the following types of motors: radial inner rotor motor, radial outer rotor motor, and axial flux motor.

8. The driving device as claimed in claim 7, characterized in that, When the type of the drive device is the radial inner rotor motor, the drive device further includes: The first bearing (5) is sleeved on the first shaft (11); The second bearing (6) is sleeved on the second shaft (12); End cap (7) is connected to the first bearing (5) and the second bearing (6). The end cap (7) has a cavity (73) for accommodating the rotor (2), the adjusting mechanism (4) and a portion of the shaft (1). The stator (3) is connected to the end cap (7).

9. The driving device as claimed in claim 8, characterized in that, The end cap (7) includes: The first end cap (71) is sleeved on the first shaft (11) via the first bearing (5). The second end cap (72) is sleeved on the second shaft (12) via the second bearing (6) and connected to the first end cap (71).

10. A household appliance, characterized in that, Includes the drive device as described in any one of claims 1 to 9.

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